SpringBoot 图形验证码的生成和校验_将内存中的图片通过流动形式输出到客户端失败

1. 编写工具类

package com.cn.beauty.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Random;

public class RandomValidateCodeUtil {
   
    public static final String RANDOMCODEKEY = "MEISHANG-LOGIN-RANDOMVALIDATECODEKEY";//放到session中的key
    private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
    private int width = 95;// 图片宽
    private int height = 40;// 图片高
    private int stringNum = 4;// 随机产生字符数量
    private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
    private Random random = new Random();

    /**
     * 获得字体
     */
    private Font getFont() {
   
        return new Font("Wide Latin", Font.PLAIN, 18);
    }

    /**
     * 获得颜色(粉色为主)
     */
    private Color getRandColor() {
   
        ArrayList<Color> colors = new ArrayList<Color
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37